enabled and fixed -Wmissing-prototypes compiler warnings

Co-authored-by: matt335672 <30179339+matt335672@users.noreply.github.com>

tests/common/test_list_calls.c

@@ -147,10 +147,6 @@ START_TEST(test_list__simple_strdup_multi)
 }
 END_TEST
 
-int
-split_string_append_fragment(const char **start, const char *end,
-                             struct list *list);
-
 START_TEST(test_list__append_fragment)
 {
     struct list *l = list_create();

tests/libxrdp/test_xrdp_sec_process_mcs_data_monitors.c

@@ -11,7 +11,7 @@ struct xrdp_sec *sec_layer;
 struct xrdp_rdp *rdp_layer;
 struct xrdp_session *session;
 
-void setup(void)
+static void setup(void)
 {
     rdp_layer = (struct xrdp_rdp *)g_malloc(sizeof(struct xrdp_rdp), 1);
     session = (struct xrdp_session *)g_malloc(sizeof(struct xrdp_session), 1);
@@ -22,7 +22,7 @@ void setup(void)
     sec_layer->rdp_layer = rdp_layer;
 }
 
-void teardown(void)
+static void teardown(void)
 {
     g_free(sec_layer);
     g_free(session);

tests/memtest/libmem.c

@@ -7,6 +7,7 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include "libmem.h"
 #include "log.h"
 
 #define ALIGN_BY 32

tests/xrdp/test_bitmap_load.c

@@ -48,11 +48,11 @@ static int WHITE = COLOR24RGB(255, 255, 255);
 /* Time to allow some large bitmap test suites to run on slower platforms */
 #define LARGE_BM_TEST_SUITE_TIMEOUT 10
 
-void setup(void)
+static void setup(void)
 {
 }
 
-void teardown(void)
+static void teardown(void)
 {
 }
 

tests/xrdp/test_xrdp_region.c

@@ -61,7 +61,7 @@ static pixman_box16_t test_box =
     0, 0, 100, 100
 };
 
-pixman_box16_t *__wrap_pixman_region_extents(pixman_region16_t *region)
+static pixman_box16_t *__wrap_pixman_region_extents(pixman_region16_t *region)
 {
     check_expected_ptr(region);
     return mock_ptr_type(pixman_box16_t *);
@@ -107,7 +107,7 @@ static void test_xrdp_region_get_bounds__happy_path(void **state)
     g_free(rect);
 }
 
-pixman_bool_t __wrap_pixman_region_not_empty(pixman_region16_t *region)
+static pixman_bool_t __wrap_pixman_region_not_empty(pixman_region16_t *region)
 {
     check_expected_ptr(region);
     return mock_type(pixman_bool_t);